Abcoulomb
abcoulomb | |
---|---|
electromagnetic units | |
Symbol | abC, aC |
Named after | Charles-Augustin de Coulomb |
Derivation | abA⋅s |
Conversions | |
1 abC in ... | ... is equal to ... |
CGS base units | g1/2⋅cm1/2 |
SI units | 10 C |
CGS electrostatic units | 2.997925×1010 statC |
Gaussian units | 2.997925×1010 Fr |
The abcoulomb (abC or aC) or electromagnetic unit of charge (emu of charge) is the
The name "abcoulomb" was introduced by Kennelly in 1903 as a short form of (absolute) electromagnetic cgs unit of charge that was in use since the adoption of the cgs system in 1875.[1] The abcoulomb was coherent with the cgs-emu system, in contrast to the coulomb, the practical unit of charge that had been adopted too in 1875.
CGS-emu (or "electromagnetic cgs") units are one of several systems of electromagnetic units within the
In the electromagnetic cgs system, electric current is a fundamental quantity defined via
The definition of the abcoulomb follows from that of the abampere: given two parallel currents of one abampere separated by one centimetre, the force per distance of wire is 2 dyn/cm. The abcoulomb is the charge flowing in 1 second given a current of 1 abampere.
References
- ^ A.E. Kennelly (1903) "Magnetic units and other subjects that might occupy attention at the next international electrical congress" 20th Annual Convention of the American Institute of Electrical Engineers, 1903 accessed 10 December 2020